When feeding Modi this morning, I noticed that he has a strange white pimple-looking spot on his head. It's tiny, but too large to be ick, and it definitely wasn't there yesterday. I'm not sure if he's got a piece of god-knows-what rubbish stuck to himself, which happens from time to time, or if this is some sort of disease that I should be worrying about. He's active, eating normally with his usual enthusiasm, and not showing any signs of bloating or abnormal appearances/behaviour apart from the white spot. The spot itself, it's hard to tell if it's stuck to his head or coming out from under the skin. It's not fuzzy in texture, but it is protruding slightly.
Thanks in advance, everyone.
What size is your tank? 3.5 gallons
What temperature is your tank? 80 degrees Fahrenheit
Does your tank have a filter? Yes, Eden 501 canister
Does your tank have an air stone or other type of aeration? No
Is your tank heated? Yes
What tank mates does your betta fish live with? None
What type of food do you feed your betta fish? NLS Betta Formula and two freeze-dried bloodworms once per week
How often do you feed your betta fish? 4 to 5 pellets per day, split into multiple feedings
How often do you perform a water change? 2 times per week
What percentage of the water do you change when you perform a water change? 50% per water change
What type of additives do you add to the water when you perform a water change? API Stress Coat
Have you tested your water? If so, what are the following parameters? No testing kit at the moment
Symptoms and Treatment
How has your betta fish's appearance changed? A tiny pimple-like white spot on the top of his head
How has your betta fish's behavior changed? Hasn't changed at all, completely normal
When did you start noticing the symptoms? This morning
Have you started treating your fish? If so, how? No
Does your fish have any history of being ill? He had ick and recovered completely using just aquarium salt + heat nearly six months ago
How old is your fish (approximately)? 9 months old
This is the best photo of the spot that I could get with my horrible little point-and-shoot, as my Canon Rebel DSLR is in storage...